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re PR rtl-optimization/7409 (loop optimization) 

PR opt/7409
	* loop.c (loop_regs_scan): Mark registers used for function
	argument passing as MAY_NOT_OPTIMIZE.

From-SVN: r58160
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Ulrich Weigand 2002-10-15 14:42:52 +00:00 committed by Ulrich Weigand
parent 3665e8a7ea
commit 6b4f2a99b7
2 changed files with 25 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2002-10-15 Ulrich Weigand <uweigand@de.ibm.com>
PR opt/7409
* loop.c (loop_regs_scan): Mark registers used for function
argument passing as MAY_NOT_OPTIMIZE.
2002-10-14 Neil Booth <neil@daikokuya.co.uk>
PR preprocessor/7862

19
gcc/loop.c
View File

@ -9560,6 +9560,25 @@ loop_regs_scan (loop, extra_size)
if (GET_CODE (insn) == CODE_LABEL || GET_CODE (insn) == JUMP_INSN)
memset (last_set, 0, regs->num * sizeof (rtx));
/* Invalidate all registers used for function argument passing.
We check rtx_varies_p for the same reason as below, to allow
optimizing PIC calculations. */
if (GET_CODE (insn) == CALL_INSN)
{
rtx link;
for (link = CALL_INSN_FUNCTION_USAGE (insn);
link;
link = XEXP (link, 1))
{
rtx op, reg;
if (GET_CODE (op = XEXP (link, 0)) == USE
&& GET_CODE (reg = XEXP (op, 0)) == REG
&& rtx_varies_p (reg, 1))
regs->array[REGNO (reg)].may_not_optimize = 1;
}
}
}
/* Invalidate all hard registers clobbered by calls. With one exception: